Maybe it could be treated similar gathering.You spend "X" hours "chatting up the local barkeeps"

Possible results could be:1) a random number of kegs refilled for free.2) you stagger away drunk with no kegs but had a great time.3) you wake up the next morning with a hell of a headache (fatigue) and find yourself in the local jail.4) you wake up in a back alley the next morning and find you have been robbed (silver or kegs).

"The only thing you can't trade for your heart's desire...is your heart." "You are what you do. Choose again, and change." "One of these days, someone's gonna plug you, and you're going to die saying, 'What did I say? What did I say?'" ~ Miles Naismith Vorkosigan

Limiting it to one per hour to the max of your empty kegs sounds reasonable. With the recent spellcasting stymie, I wonder what damage you think they can do now?

Kegs? Advies without spellcasting are pretty much just monster hunters.

I think you should only be allowed to keep one keg to be honest. But make that keg reduce your fatigue by 10 per use. Once you use it three times, it becomes empty. I can't even imagine an adventurer with a loaded cart full of kegs.